For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningRear Side Door Upper Hinge and Lower Hinge Replacement
Preliminary Procedure
Remove the rear side door. Refer to Rear Side Door Replacement.
Rear Side Door Hinge Bolt (Qty: 4)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
25 N·m (19 lb ft)
Reart Side Door Hinge
Procedure
Adjust rear side door as needed. Refer ...
Hazard Warning Flashers
(Hazard Warning Flasher):
Press and momentarily hold this button on the instrument panel above the climate
control system, to make the front and rear turn signal lamps flash on and off. This
warns others that you are having trouble.
Press and momentarily hold again to turn the flashers off ...
Installation Procedure
Remove the front wheelhouse rear panel brace (1) from service panel.
Create 6 x 20 mm (4/16 x 12/16 in) slots for MIG-brazing along the edges
of the front wheelhouse (1).
Clean and prepare the attaching surfaces for brazing.
Note: In MIG-brazing areas 50 mm (2 in) must b ...